Gas-chamber for arc-lamps.



f E. l. WARNER & C. WILBE.

GAS CHAMBER ron ARG LAMPS.

APPLIOATION FILED SEPT.12,1906.

929,354. Patented July 27, 1909.

slatle Per NT FlllCE.

ERNEST I. WARNER AND CARL WILER7 OF CHICAGO, ILLINOIS, ASSIGNORS TO WESTERN ELECTRIC COMPANY, OF CHICAGO. ILLINOIS, A CORPORATION OF ILLINOIS.

GAS-CHAMBER FR ARC-LAMPS.

To all whom t may concern.'`

Re it known that we, ERNEST P. VARNER and CARL lViLnr., citizens of the United States, residing at Chicago, in the county of Cool; and State of Illinois, have invented a certain new and useful Improvement in Gas- Chambers for Arc-Lamps, of which the following is a full, clear, concise, and exact description.

Our invention relates to a gas cap especially adapted for use withelectric arc lamps, and has tor its object to provide an improved, simple, cheap and compact device for regulating the ent-ry of air to the globe surrounding the arc toV prevent at all times the free entry el' air to the globe, and for mixing with the air reaching the globe the gases developed by the are, in order to increase the life and eiiiciency of the carbone.

Our invention contemplates a gas cap in the inout-h orn an approximately air-tight globe' surrounding the are of the lamp, said cap comprising a pair of closed chambersan outer and an inner chambermprovided with a common passageway through which one of the lamp carbone extends, and through which gases developed by the arc pass into arrow passageways leading to the said chambers and are accumulated therein under pressure, the gases in said chambers acting as a check to prevent the free entry of air into the chambers and. globe.

In the operation of the lamp, when the arc is burning, the' gases generated thereby ilow into the chambers and are retained therein under pressure. As the arc continues to burn the excess oiC gas generated passes out ot' the globe through the common passageway surrounding the carbon, which passageway in practice is very small, and of course' acts as a cheek to prevent the entrance of free air to the globe. A very limited amount of air is admitted tothe globe, however, but not before is thoroughly mixed with the gases. Now when the generation of gas becomes less, for instance, when the carbons are feeding, the pressure is reduced and the gases in the chambers flow therefrom through the narrow passageways and circulate around the cai'bon in the common passageway. Due to the narrow passageways forming restricted openings romthe chambers to the common passageway, the spe'edof the flow of the gases therethrough Specification of Letters Patent.

Application filed September 12, 1906.

is increased and the gases impinge on the` Patented July 27, 1909.

Serial No. 334,237.

carbon and consequently block up the common passageway around the carbon, thus creating in eiiect a gas collar around the carbon. It will be apparent, then, that the air cannot pass this collar, except in very limited quantities, and not without being lirst thoroughly mixed with the gases. It will thus be obvious that a very eliicient gas check is produced, and that at all times during the operation of the lamp the admission of air to the globe is automatically regulated.

We will describe our invention by reinerence to the accompanying drawings, where- 1n- Figure l is a view in elevation of an electric arc lamp equipped with a gas cap embodying our invention; F ig. 2 is a detail plan view of the gas cap; and F ig. 8 is a sectional view thereof on line 3 3 of IF ig. 2.

The same letters of reference designate the same parts wherever shown.

rihe gas cap a shown is secured to the check plate Z) of the lamp at the mouth oit' the globe o which surrounds the are created by the carbons d Z1 the upper carbon passing through the check plate Z) and gas cap a. rihe gas cap comprises a main or outer chamber el' and an auxiliary or innerY chamber e2, said chambers being provided with common annular' passage e, through .which the upper carbon passes. The floors of said chambers are separated and provided with annular openings therein forming said passageway. lr'he upper carbon passes through cover ,t for the inner chamber a?, said cover having an annular flange or collar g, through which the carbon d passes, said liange terminating a short distance above the bottom tloor of the chamber a2, so as to leave a narrow annular passage way from said chamber into the passage through which the carbon Z passes. rEhe check plate l) preferaoly forms a cover for the outer chamber. The space between said iioors forms a narrow intermediate passage leading from the common passageway Vand opening into the main or outer chamber at all sides thereof. r'hus the gases developed by the arc lill the chambers al e2 of the gas cap and serve as a check or cushion to prevent the entry of tree air to the globe, but when the carbons are feeding and the amount of gas generated is lessened, the air is allowed to enter the chambers through the slight space between the upper carbon and the cover f'of the inner chamber, `-Where it is miXed with the gases of the are and admitted to the arc in a diluted form. In case either chamber should be destroyed by a short circuit or otherwise, the remaining chamber Will be effective alone to regulate the admission of air to the globe, since the two chambers are independent or' each other. Y

7e claim:

l. A gas cap comprising two concentrically arranged cup-shaped members having alined openings in their bottoms, the vone member inclosed Within the other and spaced apart therefrom at the bottom and sides to form an innerl and an outer Chamber connected by an annular passageway, a cylindrical collar provided with an annular fiange forming a cover for the inner chamber, and a check-plate forming a cover for said outer chamber, said checleplate and collar having openings in alinement With the said. openings in the bottom of said cupshaped members.

2. ln a gas cap, the combination With an integral casting provided With an inner chamber and an outer chamber, of a flanged collar forming a cover for the inner chan ber, and a check-plate forming a cover for the outer chamber, said check-plate and collar and the bottoni walls of said chamber being provided with alined openings With which said inner chamber and said outer chamber conni'iunicate.

3. gas cap for arc lamps comprising an outer and an inner chamber, and a Collar forming part of the upper wall of said inner chamber, the lamp carbon passing through a connnon pasageway formed by said collar and openings in the floors of said chambers, the bottoni of' said collar and the floor of said inner chamber forming a narrow passageway connecting' srid inner chamber with the common passageway, said common passageway being connecJ `d with the outer chamber by -arrow passageway formed between the floors of said chambers and opening into said outer chamber at all sides thereof.

ln Witness whereof, We hereunto subscribe our names this 8th day of September A. D., 1906.

ERNEST P. WARNER CARL YVHJER. lWitnesses CLARENCE A. CoeoN, Roi* T. ALLOWAY. 

